i'm always looking for sci-fi books with a completely transporting otherworldly atmosphere if anyone has any recs specifically for that. preferably stuff with a compelling narrative to match, and not too bogged down in actual science.
Have you read any of VanderMeer's work? I know you've seen
Annihilation, but the
Southern Reach trilogy actually gets weirder the further you get into it.
But if you want some seriously transporting, surreal sci-fi, check out his novel
Borne. It's set in an indeterminate time/place (maybe another planet) in which an anonymous "company" has ecologically devastated the environment, and the characters have to survive in a landscape replete with biologically mutated lifeforms. The main character finds a blob of life that can assume various forms, and takes it into her care. It's a really weird book, but definitely checks the "otherworldly" box. His most recent book,
Dead Astronauts, is set in the same universe; I'm about sixty pages in, and it's less accessible than Borne.
In all his works, the prose assumes a surreal distance from the narrative world. So, you get a vague sense of something happening or whatever has happened, with occasional spurts of specificity. It creates a very unnerving atmosphere for readers, I think.
I'd also recommend China Miéville's
Embassytown. Otherworldly story, fascinating narrative, kinda tough read--but excellent, I thought.